Which sentence best describes the phylogenetic relationship between protists, fungi, plants, and animals?
a. Fungi and animals share a common protist ancestor, while plants arose from a different protist ancestor.
b. Fungi and plants share a common protist ancestor, while animals arose from a different protist ancestor.
c. Plants, animals, and fungi each arose from different protist lineages.
Ans: a. Fungi and animals share a common protist ancestor, while plants arose from a different protist ancestor.
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The hydroxyapatite that makes up the bulk of the bony endoskeleton of vertebrates is found in:
A. osteocytes. B. the extracellular matrix of osteocytes. C. the collagen. D. osteoblasts.
What sequence of events leads to the perception of a visual scene?
I. In response to light, retinal dissociates from rod and cone photopigments, hyperpolarizing the photoreceptor cells and leading to activation of bipolar neurons. II. Action potentials are propagated through ganglion cells, whose axons project to the occipital lobe of the brain. III. In response to light, rod and cone photoreceptors depolarize, causing increased release of neurotransmitter and activation of bipolar neurons. A. I then III B. III then II C. III then I then II D. I then II then III E. I then II
Classification.The following are chemical functional groups that may be part of a biologically active molecule. Answer the questions by matching the items with the most appropriate group.
A. Fatty acid "head" B. The group that is acidic C. The group on the carboxyl-terminal end of proteins D. The group that makes lipid head's hydrophilic E. The methyl group F. The amine group G. The group on the amino-terminal end of proteins H. Found in alcohols and sugars I. The group typical of energy carriers such as ATP J. The aldehyde group in simple sugars
Even though DNA polymerase has a proofreading function, it still introduces errors in the newly synthesized strand at a rate of 1 per 107 nucleotides
To what degree does the mismatch repair system decrease the error rate arising from DNA replication? (a) 2-fold (b) 5-fold (c) 10-fold (d) 100-fold